Heterogeneous Tin Catalysts Applied to the Esterification and Transesterification Reactions

Table 5

BET surface area measurements obtained from SO₄²⁻ SnO₂ catalysts synthesized at temperatures of 400, 550, and 750°C [29].

SO4^2− content on SnO2 catalyst (wt.%)	surface area (m^2/g)
	400°C	550°C	750°C
0	61.2	46.3	20.4
1	69.9	52.3	28.5
5	76.2	64.7	36.5
15	90.2	80.8	57.2
20	101.3	87.3	62.5
30	129.5	100.8	70.1